Hi Martin
I used an HP 690c inkjet for more than 7 years & generic Overhead Transparency Film. I used to print 2 copies & lay them one over the other to create a double layer. I have recently replaced the HP with a Lexmark Z45 & have the same good results. The 890c should work fine.
For exposure, I have 2 x 18watt Phillips UV tubes & use the PCB suppliers suggested exposure time (30 secs) at about 15 cm distance.
Peter
----- Original Message -----
From: Czech Martin
To: jorgen.bergfors at idg.se ; synth-diy at dropmix.xs4all.nl
Sent: Wednesday, February 05, 2003 1:14 PM
Subject: RE: [sdiy] PCB making: how to get a transparent foil with real black lines?
Could you please write down the exact type number of the HP foil?
After my experiments, the foil type does really matter. Some foils show
pin holes after printing, others wrinkles or cracks.
Using some OverHeadProjector foil or the other seems to be no
solution so far.
Some people seem to suggest tracing paper.
I will look at this.
And Seno 4006 developer instead of NaOH, because of the improved
handling (less sensible to temperature, not exposed areas can withstand longer).
I've noticed these difficulties with NaOH, too.
http://www.electricstuff.co.uk/pcbs.html
m.c.
-----Original Message-----
From: jorgen.bergfors at idg.se [mailto:jorgen.bergfors at idg.se]
Sent: Mittwoch, 5. Februar 2003 10:43
To: Czech Martin; synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] PCB making: how to get a transparent foil with real black lines?
>Is there someone out there how can propose a better method
>to get a layout on film?
I use the HP Deskjet 1220C. I think that most of the modern HP inkjets should work, as long as you use HP's tranparency film. The result is not totally perfect, but it is good enough, I think. You can have a look at my results here:
http://hem.bredband.net/bersyn/workshop.htm
Jorgen
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